Twin-Path® Synthetic roundslings for heavy lifting by Slingmax® Rigging Solutions are the only synthetic roundslings available that come equipped with the Check-Fast® External Warning Indicator, Covermax® Cover, and Rifled Cover® technology. Slingmax has been a trusted supplier of high performance synthetic roundslings to the industrial and heavy lifting markets since 1986. Think Twin-Path® slings for all your heavy lifting and rigging needs.

NOTE: Experts agree that over 80% of synthetic sling accidents are caused by cutting; always be SURE you have the correct Sling Protection for your specific lift!


  • Check-Fast® Inspection System provides a pass/fail (Go/No Go) inspection. If overloaded the External Warning Indicator disappears before the sling fails.
  • The separate inner cover shows red for warning that the sling is damaged and should be taken out of service for repair.
  • Twin-Path® Slings are repaired with patches. Each sling is proof tested after any type of repair.
  • Older slings may have two kinds of indicators. Tell-Tails warn of overload and Fiber Optics warn of core yarn damage.
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Twin-Path® synthetic roundslings have Check-Fast® Inspection overload indicators,Covermax® Covers for superior abrasion resistance, and inner red covers as an aid to inspection. Twin-Path® slings are used worldwide in place of steel rigging for heavy lifts. They are approximately 10% of the weight of a steel sling and are repairable. 

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The Check-Fast® Inspection System is designed to improve job site safety. The Check-Fast® External Warning Indicator (EWI) provides a criteria for pass/fail inspection when the internal load-bearing core yarn may be damaged. The Check-Fast® Inspection System can also indicate ultraviolet (UV) light degradation, fiber-on-fiber abrasion, fatigue, and severe overload.

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Rifled Cover® Technology is a major patented breakthrough only available on Slingmax® Twin-Path® high-performance fiber roundslings. Rifled Cover® Technology works like the inside of a rifle barrel, where the bullet spins as it leaves the muzzle of the gun. The helical winding of the core fibers significantly improves strength and efficiency.

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The Twin-Path® Adjustable Bridle (TPXA with K-Spec® fiber core yarn or TPA with polyester core yarn) is a two-leg bridle made with a Twin-Path® roundsling and adjustable bridle ring. When tension is applied to the Twin-Path® Adjustable Bridle, it self-adjusts until the lifting point is over the center of gravity (COG). This allows the two legs to be adjusted for a level lift without the need for custom slings or hardware.

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The Sparkeater® sling (SE) is the sling to use when the job site is in a hot environment (up to 300°F or 150°C). These slings are made with high-temperature core yarns and a high temperature cover.

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The Twin-Path® Field Taper is a removable, repositionable wrap that reduces the width of TPXCF slings onsite. This is a tool that can be utilized to fit a sling into smaller openings without sacrificing sling capacity.

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